Original WW-2 German
vehicle ID flag. It has a metal grommet in each of the corners to tie it to
tanks and other vehicles so that the Luftwaffe would not strike them. Of course
this would be an early war thing since the allies had the sky following D-day.
As an interesting side note, I recently saw some TV footage of the initial Iraq
invasion I was surprise that with all of our technology and communication I
saw an Abrams tank with a US flag tied across the top.